How to create materials?
You find the material properties in the Default Layout on the right side:



Your object already has a default material you can change the color by changing the settings in the section Diffuse.

To create more materials first create a new slot '+' symbol and press new.

Transparency is setup by ticking Transparency and ajusting the Alpha Slider.

If want to assign materials to single faces select the face and material in Edit Mode and press Assign.

Since you just started:This is only a tiny part of what you will learn about materials.

Please checkout the resources we already collected here:

Beginner&#39;s Reference